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Cos^2(π/4-θ) / Sin(π/4+θ)
人气:444 ℃ 时间:2020-03-28 03:53:35
解答
Cos^2(π/4-θ) / Sin(π/4+θ)
=Cos^2(π/4-θ)/ Cos(π/4+θ-π/2)
=Cos^2(θ-π/4) / Cos(θ-π/4)
=Cos(θ-π/4)
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